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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VARIATIONS_NET_VARIATIONS_URL_LOADER_THROTTLE_H_
#define COMPONENTS_VARIATIONS_NET_VARIATIONS_URL_LOADER_THROTTLE_H_
#include <memory>
#include <string>
#include <vector>
#include "components/variations/variations.mojom.h"
#include "third_party/blink/public/common/loader/url_loader_throttle.h"
#include "url/origin.h"
namespace variations {
enum class Owner;
class VariationsClient;
// For non-incognito sessions, this class is created per request. If the
// requests is for a google domains, it adds variations where appropriate (see
// VariationsHeaderHelper::AppendHeaderIfNeeded) and removes them on redirect
// if necessary.
class VariationsURLLoaderThrottle : public blink::URLLoaderThrottle {
public:
// Constructor for throttles created outside the render thread. Allows us to
// distinguish between Owner::kUnknownFromRenderer and Owner::kUnknown for
// ResourceRequests without TrustedParams. See IsFirstPartyContext() in
// variations_http_headers.cc for more details.
//
// TODO(crbug.com/40135370): Consider removing this once we've confirmed that
// non-render-thread-initiated requests have TrustedParams when needed.
explicit VariationsURLLoaderThrottle(
variations::mojom::VariationsHeadersPtr variations_headers);
// Constructor for throttles created in the render thread, i.e. via
// VariationsRenderThreadObserver.
VariationsURLLoaderThrottle(
variations::mojom::VariationsHeadersPtr variations_headers,
const url::Origin& top_frame_origin);
~VariationsURLLoaderThrottle() override;
VariationsURLLoaderThrottle(VariationsURLLoaderThrottle&&) = delete;
VariationsURLLoaderThrottle(const VariationsURLLoaderThrottle&) = delete;
VariationsURLLoaderThrottle& operator==(VariationsURLLoaderThrottle&&) =
delete;
VariationsURLLoaderThrottle& operator==(const VariationsURLLoaderThrottle&) =
delete;
// If |variations_client| isn't null and the user isn't incognito then a
// throttle will be appended.
static void AppendThrottleIfNeeded(
const variations::VariationsClient* variations_client,
std::vector<std::unique_ptr<blink::URLLoaderThrottle>>* throttles);
private:
// blink::URLLoaderThrottle:
void DetachFromCurrentSequence() override;
void WillStartRequest(network::ResourceRequest* request,
bool* defer) override;
void WillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::mojom::URLResponseHead& response_head,
bool* defer,
std::vector<std::string>* to_be_removed_headers,
net::HttpRequestHeaders* modified_headers,
net::HttpRequestHeaders* modified_cors_exempt_headers) override;
// Stores multiple appropriate variations headers. See GetClientDataHeaders()
// in variations_ids_provider.h for more details.
variations::mojom::VariationsHeadersPtr variations_headers_;
// Denotes whether the top frame of the request-initiating frame is a Google-
// owned web property, e.g. YouTube.
Owner owner_;
};
} // namespace variations
#endif // COMPONENTS_VARIATIONS_NET_VARIATIONS_URL_LOADER_THROTTLE_H_
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